It appears that some of the ENC files are basically ZIP files so you can work with them using any ZIP supporting software. You can always try to rename a ENC file as ZIP and see if its extractable.
Convert Uuencode encoded file to WinZIP Compressed ZIP archive.
We have found 3 software records in our database eligible for .enc to .zip file format conversion.
Microsoft Windows software - convert enc to zip on Windows
A compression utility that supports over 250 archive formats
Convert from enc file format
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned enc to zip. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
Apple macOS / Mac OS X software - convert enc to zip on OS X
Mac version of the popular utility
A backup and archive utility